Open Question: What fictional supporting character could support their own movie?

Sony's attempts to turn Spider-Man's supporting cast into anchors for their own movies has been largely lousy. But maybe the idea could work elsewhere?

Earlier this week I reviewed Venom: The Last Dance, the third film built around Venom, a Spider-Man-villain-turned-sort-of-hero. Venom’s had a long life as a comic book character both as a Spider-Man foil on his own. Marvel’s even built a whole mini-universe of symbiote characters around him. But does he work as the lead of a movie? I guess the short an…